Pneumatic pump



A. KUETHER.

PNEUMATIC PUMP.

APPLICATION FILED MAR. 21. 1921.

EAQEAM. Patented Aug. 8, 1922.

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arise ST AUGUST KUETHER, 0F MILWAUKEE, WISCONSIN.

PNEUMATIC PUMP.

Application filed March 21, 1921.

To all whom it may concern:

Be it known that I, Aoensr Konrrmn, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented a certain new and useful Improvement in Pneumatic Pumps, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

This invention relates to pneumatic pumps, and more particularly, to tire pumps, although certain features thereof may be employed to advantage in pumps of other types.

Pumps have heretofore been constructed in which two pistons are employed, arranged in tandem and operable in opposite directions to producethe desired air pressure. These pistons are ordinarily arranged to reciprocate horizontally and are usually actuated by an upwardly extending hand lever mounted to swing about a horizontal axis. The present invention has to do with pumps of this character.

One object of the invention is to provide an improved operating connection between the operating lever and pistons, whereby a limited movement of the handle will produce a maximum piston stroke, thus permitting the operator to remain in an upright position during the pumping operation.

Another object is to provide a novel actuating device for-the pistons whereby it is possible to obtain a maximum piston stroke in a pump of minimum overall dimensions. This is of particular importance when the pump is to form a part of an automobile equipment, since the storage space in an automobile is usually very limited.

Other objects and advantages will later appear.

Two embodiments of the invention are illustrated in the accompanying drawings, in which:

Figure 1 is a side elevation, partly in section, of a hand pump constructed in accordance with the present invention.

Fi re 2 is a sectional view taken substantlally on the line 2 2 of Figure 1.

Figure 3 is a side elevation of a pump Specification of Letters Iatent.

Patented tlas, 1922;

Serial No. 454,116.

of somewhat different form, embodying the features of the present invention. u

F gure 41 is a detail illustrating certain valve mechanism employed. The pump illustratedin Figures 1 and 2 includes a pump barrel or working cylinder 10, closed at both ends by the usual cylinder caps 11 and enclosing a pair of pistons 12. The plstons 12 are reciprocally mounted in the cylinder 10 and are connected by any appropriate means, such as a bar 13. Each piston is provided with the usual cup-shaped washer 12 for preventing escape of air past the piston during its outward or working stroke and for permitting the passage of air past the piston during its inward or suction stroke. Each piston is thus designed to cooperate with an end of the cylinder to compress the air therein and to force the air therefrom through a tube 14. Each tube 14 is connected with a main discharge tube 15 by any appropriate means such, for instance, as will now be described.

A T-shaped fitting for this purpose is illustrated in Figure 4. This fitting includes a pair of hollow arms 16 for connection with the tubes 14 respectively and a third hollow arm 17 connected with arms 16 and adapted for connection with the main discharge tube 15. Each arm 16 is provided with a check valve of any standard or approved type for permitting the flow of air in only one direction through each arm lti. The check valves shown are similar to those ordinarily employed in a tire tube. Each includes a valve piece 18, yieldably held in closed position against a valve seat 19 by a spring 20. The other end of spring 20 engages a bridge piece 21 mounted within the arm 16 and abutting a ring or shoulder 22 positioned therein. The valve piece 18 is preferably provided with a valve stem 23 reciprocally mounted in the bridge piece 21. Thus it will be seen that air may flow from the tube 14 past the valve piece 18 and into and through the arm 17 to the tube 15 but not in the reverse direction.

The cylinder 10 is mounted u on a bracket of any appropriate type. he bracket shown in Figures 1 and 2 comprises a pair of uprights 24 secured to the cylinder and connected together by a rigid piece 25. A.

pair of clamps 26, of any standard or approved type, are preferably provided to secure thepump to any suitable support, such as the running board 27 of an automobile. n

Mechanism for actuating the pistons will now be described. This mechanism ineludes a gear segment 28 mounted upon a fixed pivot 29 preferably supported on the member 25. The gear segment is provided with gear teeth 30, meshing with correspond-i ing teeth 31 on the bar 13 above referred to. This segment projects through a slot 32 formed in the wall of the cylinder. Due to this geared connection, this slot may be much shorter than would. be required should a direct connection between the operating handle and bar 13 be employed. This is of importance since the length of the slot limits the effective stroke of the pistons in the cylinder.

The segment 28 is actuated preferably by a lever 33 connected thereto in such manner that a full rocking movement of the segment may be effected by a rather limited swinging movement of the lever. For this purpose, the lever 33 is rockably supported on a fixed pivot 34. In this instance, the lever is provided with a yoke portion 35 embracing the cylinder 10 and avpinextending through the cylinder constitutes the fixed pivot 34:. The bar 13 is slotted, as shown at 35, to accommodate this pin. A pivotal and sliding connection is preferably effected between the segment 28 and the lower end of the lever. For this purpose, the lever is provided with a pin 36 carrying a roller 37 engageable in a slot 38 formed in the segment. The upper end of the lever is preferably provided with a socket 39 or otherwise fashioned to receive the end of an operating handle 40.

Thus it will be seen that by swinging the operating handle 4L0 and lever 38 in a clockwise direction (Figure 1), the gear segment 28 is rocked in a counterclockwise direction and the pistons are forced toward the left. This action causes the piston on the left to compress the air in its end of the cylinder and to force the air-from the cylinder through the corresponding tube 14 to and through the discharge tube 15. At the same timeair entering the cylinder through the slot 32 passes the piston on the right and fills the space-in the right end of the cylinder. Then when the handle is swung in the other direction the reverse action occurs, thepistons move'toward the right and air is forced from the right end of the cylinderthrough the corresponding tube 14 and to and throughthe discharge tube 15. The pump shown in Figure 3 is similar in many respects to that above described. In this instance,however, thecylinder 10 is supported on a pairof uprights 24 secured to a flat base portion 25. The member 25" is of sufficient length in this instance to permit the operator to place his feet thereon at opposite sides of the gear segment 28.

and thus firmly hold the pump in position. he segment 28 is actuated by a lever 33, similar to that above described, mounted upon a fixed pivot 34 and connected with operating with said connection to reciprocate said pistons, and a lever pivotally connected with said member to actuate the same. i 1

2. In a pump the combination of a'cylinder, a pair of pistons in said cylinder, a bar connecting said pistons'and provided with gear teeth, a slot in said cylinder intermediate said pistons, a rockable member extending through said slot and provided with gear teeth meshing with the teeth on said bar, and a lever pivotally connected with said member to actuate said member and reciprocate saidpistons.

3. A pump having a pair of pistons connected together, in tandem relation, a cylinder enclosing each of said pistons, and means for actuating said pistons, including a gear segment, and a lever pivotally connected therewith for actuating saidsegment,

said lever being 'fulcrumedat a point spaced fronrthe' axis of said gear segment.

4. A pump having a pair of pistons connected together in tandem relation, a cylinder enclosing each of said pistons, means including a rockable element for reciproeating said pistons,'and a lever mounted upon a fixed pivot spaced from the axis about whichsaid element rocks and connected with said element for rocking said element. 1 H

5. pump having a pair'of pistons arranged in tandem, a cylinder enclosing each of said pistons, a connection between said pistons, a rockable element cooperating with said connection to reciprocate saidpistons,

and a lever mounted upon a fixed pivot spaced 'from the axis about which said element rocks and connected with said element for rocking said element.

6. A pump having a cylinder, a pair of pistons. reciprocally mounted therein, a lever pivotally mounted on said cylinder between said pistons and. extending above said cylinder, connections between said pistons, a rockabie element mounted on an axis below said cylinder and cooperating with said connections to actuate said pistons, and connections between said lever and element through which said element is actuated by said lever.

7. A pump having a pair of pistons connected together in tandem relation, a gear segment cooperating therewith to recipro- 10 cate said pistons, a slot in said segment, and means engageable in said slot for actuating said segment.

In'witness whereof, I hereunto subscribe my name this 16th da of March, 1921.

AU UST KUETHER. 

